#region Copyright (c) 2007 Ryan Williams <drcforbin@gmail.com>
/// <copyright>
/// Copyright (c) 2007 Ryan Williams <drcforbin@gmail.com>
/// 
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
/// 
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
/// 
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.
/// </copyright>
#endregion

using System;
using System.Collections.Generic;
using System.Text;

using Mono.Cecil;
using Mono.Cecil.Metadata;

namespace Obfuscar
{
	/// <summary>
	/// Used to identify the signature of a method by its name and parameters.
	/// </summary>
	class NameParamSig : ParamSig, IComparable<NameParamSig>
	{
		readonly string name;
		readonly int hashCode;

		public NameParamSig( MethodReference method )
			: base( method )
		{
			name = method.Name;

			hashCode = CalcHashCode( );
		}

		public NameParamSig( MethodDefinition method )
			: base( method )
		{
			name = method.Name;

			hashCode = CalcHashCode( );
		}

		private int CalcHashCode( )
		{
			return name.GetHashCode( ) ^ base.GetHashCode( );
		}

		public string Name
		{
			get { return name; }
		}

		public virtual bool Matches( MemberReference member )
		{
			MethodReference methodRef = member as MethodReference;
			if ( methodRef != null )
			{
				if ( methodRef.Name == Name && methodRef.Parameters.Count == ParamTypes.Length )
				{
					for ( int i = 0; i < ParamTypes.Length; i++ )
					{
						if ( Helper.GetParameterTypeName( methodRef.Parameters[i] ) != ParamTypes[i] )
							return false;
					}

					return true;
				}
			}

			return false;
		}

		public bool Equals( NameParamSig other )
		{
			return other != null &&
				hashCode == other.hashCode && 
				name == other.name &&
				Equals( (ParamSig) other );
		}

		public override bool Equals( object obj )
		{
			return obj is NameParamSig ? Equals( (NameParamSig) obj ) : false;
		}

		public static bool operator ==( NameParamSig a, NameParamSig b )
		{
			if ( (object) a == null )
				return (object) b == null;
			else if ( (object) b == null )
				return false;
			else
				return a.Equals( b );
		}

		public static bool operator !=( NameParamSig a, NameParamSig b )
		{
			if ( (object) a == null )
				return (object) b != null;
			else if ( (object) b == null )
				return true;
			else
				return !a.Equals( b );
		}

		public override int GetHashCode( )
		{
			return hashCode;
		}

		public override string ToString( )
		{
			return String.Format( "{0}[{1}]", name, ParamTypes.Length );
		}

		public int CompareTo( NameParamSig other )
		{
			int cmp = String.Compare( name, other.Name );
			if ( cmp == 0 )
				cmp = CompareTo( (ParamSig) other );
			return cmp;
		}
	}
}
